Air-starting valve for diesel engines.



G. C. DAVISON.

AIN STARTING vALvE EoII DIESEL ENGINES.

Patented Nov. 14, 1916.

2 SHEETS-SHEET l.

APPLICATION FlLED APR. 3. 1916.

I/III/EA/ro/I Arma/VHS.

APPLICATION FILED APR. 3. 1916.

Patented Nov. 14, 1916.

2 SHEETS-SHEET 2.

ATTORI/HSI GREGORYC. DAVISON, OF NEW LONDON, CONNECTICUT, ASSIGNOR TOELECTRIC BOAT COMPANY, OF NEW YORK, N'.Y Y., A CORJ'EORA'IION OF N EW' vZI' EB'SEY.`

AIR-STARTING VALVE FOR DIESEL ENGINES.

moines.

' Specification of Letters Patent.

Application led April 3, 1916. Serial No. 88,558.

To all whom t may concern.' V

Be it known that I, GREGORY CIDAVISON, a citizen of the United States, and a resident of New London, in the county of New London and State of Connecticut, have invented certain new and useful Improvements in Air-Starting Valves for Diesel Engines; an I do hereby'declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention is directed to the provision of an improved form of air-starting valve for use on internal combustion engines in admitting compressed air to the cylinder` of an engine for the purpose of starting the engine in operation.

The object of the invention is to provide a valve of this character of an improved construction with which reliable and eiiicient operation is obtained, which permits of regrinding the valve surfaces conveniently and with which a very simple construction of the cylinder structure for the reception of the valve may be employed.

The invention involves the provision of an air-starting valve comprising a valvecage which consists of two tubular members fitting one within the other' and forming achamber between them and a stem adapted to reciprocate within and be guided by the inner tubular member, this stem having a valve member upon its end whichv is movable into and out of coaction with a valve seat upon the inner end of the outer tubular member. IV ith a valve of this construction provision may be made for admitting air to the chamber of the valve through a transverse opening in the outer end of the outer tubular member ofthe valve-cage, which portion of the valve-cage lies outside of the cylinder structure when the valve is mounted in position. This characteristic of the valve structure makes it unnecessary to provide air passages in the cylinder structure which would require the use of a core during the casting operation or a difficult boring operation thereafter.

Instead, the -cylinder structure is merely provided with a cylindrical well or opening into which the valve-cage fits, the air connection to the valve being'made outside the cylinder structure and theV inner endV of the lin the simplicity of the construction as a- Y whole and the compact arrangement of the parts whereby the moving parts are so housed and guided as to avoid all danger of displacement thereof, as a result of which a valve is produced which is reliable and 'raeentedivem 14, 191e.

efficientV in operation and which may be continued 1n operation for an extended period without appreciable wear.

I have illustrated the preferred embodiment of the invention in the accompanying drawings, in which- Figure l is a longitudinal section of the valve; Fig. 2 is a perspective view of a portion of an inner tubular member; Fig. 3 is a transverse section on. line 3 3 of Fig. l; and Fig. 4 is a top view of the valve.

- Referring to these drawings and particularly to Fig. l, the valve structure includes a valve-cage which consists of inner and outer tubular members tting one within the other and formed to provide a chamber between them. The valve-cage as a whole is indicated by the reference S and the two tubular members constituting the cage are indicated by the references Sa and S". The valve-cage consisting of these two parts is adapted to be inserted within an opening or well provided in the cylinder casting.

This cylinder casting is indicated at 5 on Fig. 1 and the interior surface of the cylinder is indicated at 6. The two tubular members are secured together by means of coacting threads on the outer end portions thereof. The inner member is slightly shorterthan the'outer one so that its inner end is inclosed within the inner end of the outer tubular member and the chamber 14:

between the two members extends beyond the end of the inner tubular member toY an inlet opening at the inner end of the inner tubular member. The inner tubular membery is positioned relatively tothe outer one at the inner end thereof by parts which bear upon the inner surface of the outer tubular member, but these parts are spaced so that they do not interrupt the flow of air through the valve. the inner tubular member is shown as pro vided with a plurality of spaced projections 21'of such size that their outer ends bear upon the interior surface ofthe outer tubular member. The air admitted to chamber 14 may therefore pass freelybetween the projections 21 to and beyond the inner end of the tubular member and into the space 20 within the inner end of the outer tubular member. This air is admitted to the chamber. 14 through a transverse passage 18 eX- tending from chamber 14 through the outer tubular member and connected to a suitable air-supply pipe.

Theinner tubular member forms a guide for avalvefstem, a portion of which is preferably enlarged to form a piston whereby the valve is f substantially balanced in the closed position and a spring is provided for returning the valve to the Vclosed position afterit has beenopened by one of the cams ofthe engine. The valve-stem is shown at 8 extendingV entirely through the valve-cage.` At its vinner end it carries a .valve member 22 inthe form of a disk which is movable toward and away from a seat formed upon the innerend of the outer tubular member. The stem 8 is also enlarged at 9 to form a piston which is located at the inner end ofthe inner tubular lmember so that the air pressure within the chamber 14 is exerted against this piston 9 and also against the valve member 22 and results in balancing the valve `in a closed position.

The valve 1s moved to the closed position by. a Vspring 10 which is coiled about thev valve-stem and'is housed withinV the inner tubular member. One end of this spring bears upon a wall of the inner tubular member. and theother end bears upon a cap 7 which is .secured upon the stem 8 .by means` of "nuts;11. InL order tocenter the spring 10'and guideit in :its movements, the cap 7 is-given a cross-sectional shape, indicated in Fig'l, so thatit embraces one end of the spring` .10. Also, a tube 7r may be provided upon the stem 8; extending from the cap 7 to the piston 9 in continuation of the inner annular wall of the cap 7 so that the spring 10 .will be completely inclosed within the Y Y 'annular space between theparts Sb, 7 and 7.

Theparts of the valve so constructed may be readilyA assembled by merely inserting the inner tubularmember within the outer one and bringing the threads Ythereof' into engagement. If it be desiredto do sothe two tubular vmembers `may be4 permanently secured together Aas by welding them` together.

Such weldingb together ofthe valve parts is.

In Figs. 1 and 2,

indicated atv 15. The construction of the valve is such as to permit this permanent connection of they valve parts, as separation of these parts and access to the interior of the structure of the valve-cage should never be necessary.

The valve may be readily mounted in position upon a cylinder structure by inserting it in a cylindrical well or opening such as that shown in Fig. 1, and then tightening up on nuts 17 which pass through the outer tubular member and 4into threaded openings in the cylinder casting. Prior to inserting the valve in the opening in the cylinder casting, a gasket 18a is preferably positioned upon a transverse wall of the opening in thek the chamber 14 and past the end of the inc ner tubular `member to the disk and piston 9, andton actuation of the valve-stem against the tension of spring 10, the. disk 22 will beV moved'from its seat t0 admit air to the cylinder. Ifat' anytime regrinding of the valve becomesY necessary, the entire valve structure may be removed by withdrawing the bolts `17 and the disk 22 is then readily accessible. l c

It is'tobe noted invconnection with the construction illustrated and described vincluding the sleeve 7lupon the valve stem, that the wear incidentrto reciprocation of the valve stem within the valve-cage occurs upon partswhich are detachable from the valve stem, namely, the sleeve 7 and the cap 7. By reason of this, when such wear has occurred to an objectionable extent, the

parts 7.and `7 may be removed and new onessubstituted therefor so that compensation for the wear doesfnotrequire that a valve disk which cooperates perfectly with the valve seat and the stemv on which that disk is mounted be discarded.

I'claim:

l. An air-starting valve comprising the` combination of a valve-cage consisting of innerand outer tubularmembersfitting one within the other and Aforming a chamber between them which extends beyond the inner end ofthe inner tubular member to an outlet opening at vthe innerend of the outer tubular member, a passage through the outer member near the outerend of the valve-cage and leading to said chamber, a valve stem adapted to reciprocate within the inner tubular member, a spring actuating the stem, anda valve member on the inner end of the stem coacting with the inner end of the outer tubular'member to controly the passage of air through the valve; substantially-as described.

2. An..airstarting `valve comprising/the combination of a valve-'cage consistingV of inner-fand outer tubular members fitting one within the other and forming a chamberbetween them which extends beyond the inner end of the inner tubular member to an outlet opening at the inner end of the outer tubular member, a plurality of projections upon the inner tubular member near the inner end thereof engaging the interior wall of the outer tubular member and spaced apar-t to permit the flow of air beween them, a passage through the outer member near the outer end of the valve-cage and leading to said chamber, a valve stem adapted to reciprocate within the inner tubular member, a spring actuating the stem and a valve member on the inner end or' the stem coacting with the inner end of the outer tubular member to control the passage of air through the valve; substantially as described.

3. An air-starting valve comprising the combination oi a valve-cage consisting or' inner and outer tubular members fitting one within the other and forming a chamber between them which extends beyond the inner end of the inner tubular member to an outlet opening at the inner end ofthe outer tubular member, a passage through the outer member near the outer end of the valve-cage and leading to said chamber, a valve stem adapted to reciprocate within the inner tubular member, a spring coiled about the valve stem and housed within the inner tubular member, and a valve member on the inner end of the stem adapted to be moved into and out of engagement with a valve seat upon the inner end of the outer tubular member; substantially as described.

l. An air-starting valve comprising the combination of a valve-cage consisting or" inner and outer tubular members i'itting one within the other and forming a chamber between them which extends beyond the inner end of the inner tubular member to an outlet opening at the inner end of the outer tubular member, a passage through the outer member near the outer end of the valveecage and leadingto said chamber, a valve stem adapted to reciprocate within the inner tubular member, a cap secured to the valve stem and adapted to move with the valve stem within the mer tubular member, a spring coiled about the valve stem and housed within the inner tubular member, said spring bearing at one end upon the inner tubular member and at the other upon the cap, and a valve member on the inner end or' the stem movable with the stem into and out of engagement with a valve seat formed upon the inner end of the outer tubular member; substantially as described.

5. An air-starting valve comprising the combination of a valve-cage consisting of two tubular members fitting one within the other and provided with coacting threads near their outer ends for securing them together, said members having an air-chamber between them, the outer member having a transverse aperture near its outer end leading to the chamber and a valve seat at its inner end, and the inner member having its inner end located within the out-er member and above the valve seat, a valve stem adapted to reciprocate within the inner member, a spring adapted to actuate the stem, and a valve member on the stem movable therewith into and out of engagement with said seat; substantially as described.

6. An air-starting valve comprising the combination or a valve-cage consisting of two tubular members iitting one within the other and forming a chamber between them, a passage through the outer member from said chamber near the outer end of the outer tubular member, a stem reciprocating within the inner tubular member, a valve disk upon the inner end of the stem coperating with a seat on the inner end of the valve-cage, a removable sleeve upon the valve stem and within the inner tubular member, a cap on the valve stem adapted to reciprocate within the inner tubular member, and a spring coiled about the valve stem and sleeve and housed within the inner tubular member with one end bearing upon said cap; substantially as described.

ln testimony whereof I aHiX my signature.

GREGORY C. DAVISON.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

